I had worked in odoo with API of ebay, DHl, UPS, wocommerce, shopware. I don't see any problem it to realize.
For 'every few minutes', I can't promise it. It's depending on the limti of Walmarts API
Relevant Skills and Experience
Odoo, Python, API experience
Proposed Milestones
$200 USD - Sync Order
$100 USD - Test & documentation
$33 USD - instructions
Additional Services Offered
$50 USD - Shipping information update
$300 USD - Product update, Price, stock update